diff --git a/msg/rc_channels.msg b/msg/rc_channels.msg
index 4e0e5b4944..861f3dcaad 100644
--- a/msg/rc_channels.msg
+++ b/msg/rc_channels.msg
@@ -15,6 +15,9 @@ uint8 RC_CHANNELS_FUNCTION_AUX_2=12
 uint8 RC_CHANNELS_FUNCTION_AUX_3=13
 uint8 RC_CHANNELS_FUNCTION_AUX_4=14
 uint8 RC_CHANNELS_FUNCTION_AUX_5=15
+uint8 RC_CHANNELS_FUNCTION_PARAM_1=16
+uint8 RC_CHANNELS_FUNCTION_PARAM_2=17
+uint8 RC_CHANNELS_FUNCTION_PARAM_3_5=18
 uint64 timestamp						# Timestamp in microseconds since boot time
 uint64 timestamp_last_valid					# Timestamp of last valid RC signal
 float32[18] channels						# Scaled to -1..1 (throttle: 0..1)